My Omnifixo needed a cool field kit too, but I don't own a TS80P, I own a Pinecil. There's room for improvement, but I'm pleased with it. The plate is best slid on from the side so the magnetic clamp bases don't shoot out and stick to it. The plate is fully flush with the edge when in place on top. Stays on nice and tight, the lid doesn't come off even if turned upside down and shaken.
This was printed with a .6mm nozzle at .3 layer height, in PETG. The 3 magnets are 3mm(2.65~)x8mm.
The author marked this model as their own original creation.